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TLS Online TPP Program

#Question id: 31381

Patch clamping can be used to measure the conductance properties of individual ion channels. How can patch clamping be used to determine whether the gene coding for a putative K⁺ channel actually codes for a K⁺ or a Na⁺ channel?

#Unit 13. Methods in Biology
  1. By measuring the ion selectivity of the channel using solutions containing only K⁺ or Na⁺ 
  2. By observing the shape of the channel under a microscope
  3. By measuring the ATP consumption of the cell expressing the channel
  4. By staining the channel with a fluorescent dye specific for K⁺ channels
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TLS Online TPP Program

#Question id: 12255

#Unit 10. Ecological Principles

The following three panels show the change in population size over time for two species when they are found alone and when they are found together. Which kind of interaction best describes the relationship between the two species?
TLS Online TPP Program

#Question id: 12256

#Unit 10. Ecological Principles

Ant species X preys upon ant species Y. A researcher has the following set of observations regarding the behaviour of species X where aggression signifies a predatory response.

Which of the following statement(s) are correct regarding the behaviour of Species X?

(i)    A glass bead is sufficient to elicit the predatory response.

(ii)   Both chemical and non-chemical cues are involved in the predatory response.

(iii)  Chemical cues are necessary to elicit the predatory response.

(iv) Chemical cues are sufficient to elicit the predatory response
TLS Online TPP Program

#Question id: 12257

#Unit 10. Ecological Principles

Which of the following is most likely to reduce competition in sympatric, closely related species? 
TLS Online TPP Program

#Question id: 12258

#Unit 10. Ecological Principles

The acoustical receptors are destroyed on a population of larvae and rates of wasp predation are measured on the "deaf” larvae and  on  a  population  of  normal  larvae.  Based on the  curve  in  the  figure  and  on  the  concept  that animals possess sensory mechanisms that enhance survival, one could correctly predict which of the following?
TLS Online TPP Program

#Question id: 12640

#Unit 10. Ecological Principles

Plant species produce a which type of  defensive proteins that bind to carbohydrates or carbohydrate-containing proteins. After being ingested by an herbivore, that bind to the epithelial cells lining the digestive tract and interfere with nutrient absorption
TLS Online TPP Program

#Question id: 24502

#Unit 10. Ecological Principles

60 Parasitism is generally defined  as;